The heads generally can do with a recon at around 200,000km, but the bottom end should be fine for a while still. I pulled mine down at around 220,000km and the bores were still in great condition, but the bearings were getting a little worn.

200,000 is just run in for a V8 - seriously, if the car has been maintained properly with regular oil changes there is no reason you could not double that figure. Oil consumption is the criteria, if it uses more that a litre of oil / 1200 k's, time to have a look. Your oil pressure will look a bit drastic as well. Remember 200,000 k's is only 124,000 miles, which sounds better.

My V8 5.0 has 220,000 on it, granted it has been duel fuel for 100,000 of that, but it runs like a Swiss watch. I change the oil and filter every 5,000 k's and don't run thin crap synthetic oil in it. Good old 15/40 dino.

cheers

__________________
"I married Miss Right. I just didn't know her first name was Always."

This question was asked on www.turbomustangs.com about when they fitted a turbo to there motor at what miles? Most responded by saying they'd have over 150.000 +miles not too many had troubles since either
considering a turbo would nearly double its power and maybe some tuning issues...
As said above depends on servicing and if it had ever over heated etc...Usually bottom end lasts twice as long as valve gear...

In theory, an LPG engine should last longer than a petrol fueled one. LPG leaves less engine deposits, doesn't crap up the oil as much etc etc, but I think basic maintenance is the key to long engine life, whatever fuel you use.

We had an I6 EF Taxi up here (duel fuel) that did over 900,000k's without major engine work, (3 transmissions, 2 diffs), so LPG didn't hurt this engine.

cheers

__________________
"I married Miss Right. I just didn't know her first name was Always."

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